Chapter 9 Starting the system 125

Installation and Maintenance Guide

Table 32 shows the wire connections for a DB15 X.21 adapter cable.

Replacing the cards

Refer to Chapter 19, “Replacing data cards and processing hardware,” on page 217 for instructions

about removing and installing these cards.

Table 32 DB15 X.21 adapter cable

DB26 on
WAN card Signal
DB15
X.21 cable
DB26 on
WAN card Signal
DB15
X.21 cable
1Chassis Ground 1 14 Transmit Data B 9
2 Transmit Data A 2 15
3Receive Data A 4 16 Receive Data B 11
4 Request to Send A 3 17 Receive Clock A 6
5Clear to Send A 518
619 Request To Send B 10
7Signal Ground 820
821
9Receive Clock B 13 22
10 23
11 External Clock B 14 24 External Clock A 7
12 25
13 Clear To Send B 12 26